<!DOCTYPE html>
<html lang="zh-CN">

<head>
	<meta charset="UTF-8" />
	<meta name="author" content="wangbo" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<title>变量</title>
</head>

<body>
	<script>
		// a,b的值互换
		// a的自动变大10个
	</script>
</body>

</html>